Aye, shit our clans were ninjaing the shit out of each other for about a year straight back on Terra. I think Faid has the right of it. Limiting the number of ops a clan can own will definitely promote diversity on the map without seriously effecting the op fighting its self. I don't see a real downside honestly.
@Torg: The ninja hacking has almost nothing to do with whether or not one clan "deserves" to hold an OP and, frankly, who are you to arbitrarily determine the criteria that allows a clan to "deserve" holding an OP? This is more of an issue of different time zones than anything else.